Electric switch.



No. 676,280. Patented lune ll, I90l. E. SCHULZ.

ELECTRIC SWITCH.

(Application filed Nov. 20, 1900.)

(No Model.)

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1 UNITED STATES PATENT OFFICE.

EDUARD SCHULZ, OF BARMEN, GERMANY.

ELECTRIC SWITCH.

SPECIFICATION forming partof Letters Patent N0. 676,280, dated June 11,1901. Application filed November 20,1900. Serial No. 3%,153. (No model.)

To aZZ whom it may concern:

Be it known that I, EDUARD SoHULz, a subject of the Emperor of Germany,residing at 110 Klingchollstrasse, Barmen, Germany, have inventedcertain new and useful Improvements in Electric Switches, of which thefollowing is a specification.

This invention relates to a switch for electric lamps, and has for itsobject to provide means to prevent the accidental connection or contactof the circuit connections with absolute certainty; and to this end theinvention consists in the features and in the construction, combination,and arrangement of parts hereinafter described, and particularly pointedout in the claims following the description, reference being had to theaccompanyingdrawings,formingapart of this specification, wherein-=-Figure 1 is a view, partially in side elevation and partially insection, of a lamp-socket provided with my improved switch. Figs. 2 and3 are detail views of the insulatingblocks, showing the metallic condacting-strips and springs. Fig. i is a top plan View of the twohalf-blocks assembled together; and Figs. 5 and 6 are longitudinalsections of the two half-blocks, respectively taken on the lines a"; a;and y y of Figs. 2 and 3. r

In carrying my invention into eifect I construct an insulatingcylindrical block and divide the same longitudinally and centrally intotwo parts, respectively indicated by the reference-letters A and B, saidparts when fitted together forming a cylinder which is inclosed byatubular holder (3. Each of the parts A and B is provided with a recess Dor one of the recesses containing the conducting-strip or line-contact Efor one terminal of the lamp, the other being in electrical connectionwith a contact F F, the terminals of the line-wires G G being connectedto said contacts by connections H H in any suitable construction.

In order to separate the two recesses before referred to, I cover one ofthe said recesses by a plate of insulating material I, which is providedwith a central aperture for the passage therethrough of the switch barJ, which passes transversely through each of the semicylindrical blocksreferred to. On the said switch-bar is rigidly fastened a knob by thespring 0. The insulating-plate I is adapted to move toward and from itsseat in the block B, as most clearly indicated in Fig. 6 of thedrawings. Rotatably arranged in the recess D is a ratchet-wheel L,provided with a series of eccentric faces T and upon its inner side witha series of cams or ratchets S, with which latter the pin M is inengagement.

Either one or both of the semicircular blocks is provided at its lowerend with a reduced continuation N, surrounding the terminal point, bymeans of which the usual S-piece generally employed in lamp-socketholders is dispensed with. Each of the semicylindrical blocks is formedon its upper end with a recess P, in which are disposed the pole ends HH, to which the circuit-wires are attached. These recesses are formed bythe outer rim Q and a wall R, which is longer than the radius of thesemicylindrical block. When the two semicylin- V drical blocks areremoved, the division or partition between the two is formed by the twowalls or flanges R, the flange R of one of the blocks forming thepartition on one side and the flange R of the other block forming thepartition on the other side, whereby two recesses or cells areconstituted which separate and protect the ends of the circuit-wires G Gand prevent their coming in contact with one another. The twosemicylindrical blocks are inclosed by a tubular casing G and acap-piece C, which are arranged to separate the lamp and shade-holder inthe usual manner.

The operation of the device will be readily understood from theforegoing description. The spring 0 forces the insulating-plate I awayfrom its seat. The insulating-plate I forces the pin M against the faceof the ratchet-wheel L, and said pin therefore engages the ratchets orcams S. Then by turn ing the knob or button the ratchet-wheel is V willbe thrown out of engagement with the spring-contacts F, and the circuitwill thus be broken and the lamp put out of operation. It will also beobvious that if the knob or button be turned backwardor, in other words,

if it is turned in a direction opposite to the direction in which thehands of a clock move the pin M will ride idly over the ratchets orative movement to the ratchet-wheel.

Having now described my invention, what I claim is 1. An electric switchcomprising an insulating-block formed with two semicylindrical 1sections arranged side by side, each section being provided with arecess, an insulatingplate. arranged between the adjacent faces of thesections, contact making and breaking mechanism located within saidrecesses, and recesses formed in the upper ends of said semicylindricalblocks, substantially as de scribed and for the purpose specified.

2.. An electric switch comprising two semicylindrical blocks arrangedface to face and ing-plate arranged between said adjacent faces, aswitch-bar arranged transversely in the blocks, and a contact maker andbreaker located in one of said recesses and arranged i to be operated bysaid switch-bar, substan- 1 tially as described.

3:. An electric switch comprising two semicylindrical blocks arrangedface to face andinclosed by a surrounding casing, said blocks beingrecessed upon their adjoining faces, a switch bar disposed transverselyin said blocks and movable endwise therein,ra circuit making andbreaking wheel rotatably disposed in one of said recesses and adaptedwhen turned in one direction to complete the circuit through theline-wires, and means carried by saidswitch-bar arranged to turn saidcircuit-maker when said switch-bar is turned in one direction and tohave no elfect on said circuit maker and breaker when turned in theopposite direction, substantially as described. cams S, and thus fail tocommunicate any ro- 4. An electric switch comprising two semicylindricalblocks arranged face to face and surrounded by an inclosin gcasin-g,said blocks 1 being recessed upon their adjacent faces, an iinsulating partition between the recessed i faces of said blocks, atransverse switch-bar rotatably arranged in said blocks, a ratchetwheeldisposed in one of said recesses and 5 provided on its periphery withcircuit making and breaking faces adapted to engage the terminals of theline-wires, a transverse pin carried by the switch-bar and adapted toengage ratchets formed on the face of said cirj cuit maker and breaker,and a spring for forc- 1 ing said pin into contact with said ratchets,

substantially as described.

recessed in their adjacent faces, an insulat- In testimony whereof Ihave hereunto set I my hand in presence of two subscribing wit- 1,nesses.

EDUARD SCHULZ.

Witnesses:

F. A. RrrTERsHAUs, OTTO KONIG.

